Fix $ipaddress6$ attribute name typo in the docs

fixes #6329

diff --git a/doc/18-library-reference.md b/doc/18-library-reference.md
index fcef4597bdf1ef59c1ab2454625822b7dc562be2..5a3209dfed121f83469c1a7e9509cd1df90d0d93 100644 (file)
--- a/doc/18-library-reference.md
+++ b/doc/18-library-reference.md
@@ -588,7 +588,7 @@ for [custom attributes](03-monitoring-basics.md#custom-attributes-functions) whi
 use the [abbreviated lambda syntax](17-language-reference.md#nullary-lambdas).
 
 This example sets the `snmp_address` custom attribute
-based on `$address$` and `$address6`.
+based on `$address$` and `$address6$`.
 
 ```
   vars.snmp_address = {{